See Figures 1, 2 and 3
FLUID LEVEL CHECK
The level of lubricant in the transmission should be maintained at the filler hole on all manual transmissions. This hole is on the right side. When you check the level in the transmission, make sure that the vehicle is level so that you get a true reading. When you remove the filler plug, lubricant should run out of the hole. Replace the plug quickly for a minimum loss of lubricant. If lubricant does not run out of the hole when the plug is removed, lubricant should be added until it does. Replace the plug as soon as the lubricant reaches the level of the hole.
Remove the drain plug which is at the bottom of the transmission or else on the side near the bottom. Allow all the lubricant to run out before replacing the plug. Replace the case with the correct viscosity oil. All manual transmissions, except the T4 & T5, use SAE 80W-90 gear oil. The T4 & T5 use Dexron®II automatic transmission fluid.